linux-kernel - Re: [PATCH -mm 5/5] bpf/progs: replace hard-coded 16 with TASK_COMM

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Date:   Sun, 5 Dec 2021 10:44:54 +0800
From:   Yafang Shao <laoar.shao@...il.com>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Kees Cook <keescook@...omium.org>,
        Petr Mladek <pmladek@...e.com>,
        David Hildenbrand <david@...hat.com>,
        Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Andrii Nakryiko <andrii.nakryiko@...il.com>,
        linux-mm <linux-mm@...ck.org>, bpf <bpf@...r.kernel.org>,
        "linux-perf-use." <linux-perf-users@...r.kernel.org>,
        Linux-Fsdevel <linux-fsdevel@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Michal Miroslaw <mirq-linux@...e.qmqm.pl>,
        Peter Zijlstra <peterz@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH -mm 5/5] bpf/progs: replace hard-coded 16 with TASK_COMM_LEN

On Sun, Dec 5, 2021 at 12:44 AM Alexei Starovoitov
<alexei.starovoitov@...il.com> wrote:
>
> On Sat, Dec 4, 2021 at 1:53 AM Yafang Shao <laoar.shao@...il.com> wrote:
> >
> >  static int process_sample(void *ctx, void *data, size_t len)
> >  {
> > -       struct sample *s = data;
> > +       struct sample_ringbuf *s = data;
>
> This is becoming pointless churn.
> Nack.
>
> > index 145028b52ad8..7b1bb73c3501 100644
> > --- a/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c
> > +++ b/tools/testing/selftests/bpf/progs/test_core_reloc_kernel.c
> > @@ -1,8 +1,7 @@
> >  // SPDX-License-Identifier: GPL-2.0
> >  // Copyright (c) 2019 Facebook
> >
> > -#include <linux/bpf.h>
> > -#include <stdint.h>
> > +#include <vmlinux.h>
> >  #include <stdbool.h>
> >  #include <bpf/bpf_helpers.h>
> >  #include <bpf/bpf_core_read.h>
> > @@ -23,11 +22,11 @@ struct core_reloc_kernel_output {
> >         int comm_len;
> >  };
> >
> > -struct task_struct {
> > +struct task_struct_reloc {
>
> Churn that is not even compile tested.

It is strange that I have successfully compiled it....
Below is the compile log,

$ cat make.log | grep test_core_reloc_kernel
  CLNG-BPF [test_maps] test_core_reloc_kernel.o
  GEN-SKEL [test_progs] test_core_reloc_kernel.skel.h
  CLNG-BPF [test_maps] test_core_reloc_kernel.o
  GEN-SKEL [test_progs-no_alu32] test_core_reloc_kernel.skel.h

Also there's no error in the compile log.

-- 
Thanks
Yafang